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(Asclepias hallii)
Hall’s Milkweed

Host Plant: Monarch Butterfly (Danaus plexippus) and Queen Butterfly (Danaus gilippus)

Nectar Plant: Monarchs, and other butterflies and insects

Flower Color: pink to purple

Growth Habit: herbaceous perennial that grows 2 to 3 feet tall

Range in North America: western United States except Pacific Northwest and California

Exposure: Full sun

Hardiness: 5-9

Soil Requirements: dry soils

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Hall’s Milkweed (Asclepias hallii)

Plant of Hall's milkweed (Asclepias hallii).
Flower of Hall’s Milkweed (Asclepias hallii) — Smithsonian Institution, CC0 1.0

 

Description of Hall’s Milkweed (Asclepias hallii)

Hall’s milkweed (Asclepias hallii), a member of the Apocynaceae (Dogbane Family), is a herbaceous perennial that grows from 2 to 3 feet tall and has pink and purple flowers that bloom in the summer and early fall (roughly June to September, depending on location). The leaves are simple, opposite, entire, lanceolate in shape and are 2-6 inches in length and about 1-3 inches wide. Hall’s milkweed is hardy in zones 5-9 and likes open areas with full sun that have dry soils.  More information about this plant can be found on this blog post.

Alternative Names

No other names known.

Hosted Species

Monarch Butterfly (Danaus plexippus)

Monarch butterfly on a green flower.
Monarch Butterfly (Danaus plexippus) — U.S. Fish and Wildlife Service, Public domain, via Wikimedia Commons

Queen Butterfly (Danaus gilippus)

Queen butterfly on a yellow flower.
Queen Butterfly (Danaus gilippus) — ALAN SCHMIERER, CC0, via Wikimedia Commons

Other butterflies, bees, and hummingbirds use this plant as a nectar source.

Range of Hall’s Milkweed (Asclepias hallii) in the United States and Canada

Range map of Hall's milkweed (Asclepias hallii) in the United States and Canada.

 

Habitat

Roadside habitat.
Roadside verge full of wildflowers by Christine Johnstone, CC BY-SA 2.0, via Wikimedia Commons

Hall’s Milkweed is found in open areas with full sun and sandy soil such as roadsides. It is found at high elevations from 9,400 ft to 9,900 ft.

Origin of the Name

The genus name, Asclepias, is the Greek name for the God of Medicine. The species name, hallii, is in honor of Elihu Hall, an American botanist.

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Hall’s Milkweed”

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